This classification performs a variety of laboratory tests such as analyzing physical, chemical, or biological evidence collected at a crime scene and from suspects; composes technical laboratory reports describing the results of tests; and testifies in criminal court as an expert witness. An incumbent in this classification performs duties at the entry/training level under the direct guidance of a supervisor. As experience and proficiency increases, an employee in this class is allowed to perform relatively independently. This series has second, third, and fourth levels that function at a more complex capacity.